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Wednesday, October 11, 2017

All Anthropometry Formulas and values in Paediatrics: Height, Weight, Head circumference


Weight  2.5-3.5kg 3 kg Length 45-55 cm 50cm Head circumference 33-37cm 35cm
Normal Anthropometric values at birth 
Anthropometry formula for expected parameters in pediatrics

Normal Anthropometric Values at Birth

Parameter
Range
Normal for easy memory
Weight
2.5-3.5kg
3 kg
Length
45-55 cm
50cm
Head circumference
33-37cm
35cm


Calculate body surface area from the weight (kg)
Body Surface area = (4w+7)/(w+90) m2

Ideal weight gain

Age
Expected weight
Rate of weight gain  g/day
Up to 4 months
3-6kg
30g/day
4-8 months
6-8kg
20g/day
8-12 months
8-10 kg
15g/day

Age
Rate of weight gain  g/week
3 months
200 g/week
4 – 6 months
150 g/week
7 – 9 months
100 g/week
10 – 12 months
50 – 75 g/week
1 – 2 years
40 g/week
2 - puberty
30 g/week
Weight gain, doubling time, paediatric anthropometry, Formula to calculate expected weight
All you need to remember for baby weight 

Age
Rate of weight gain  
Up to 3 months
30  g/day
3 months to 1 year
400 g/month
3-7 years
2 kg/year
7 years to adolescence
3kg/year

The weight of any baby should multiply in the following rate ideally
Birth Weight (x)
Time
Examples
(2.5kg )
2x (Doubles)
5 months
5kg
3x (Triples)
1 year
7.5kg
4x (Four Times)
2 years
10kg
5x (Five times)
3 years
12.5kg
6x (Six times)
5 years
15kg
7x (Seven times)
7 years
17.5kg
10x (Ten times)
10 years
25kg

Formula to calculate expected weight at certain age
Age
 Weech Formula
3-12 months
(Age in months + 9) / 2
1-6 years
Age(years)x2 + 8
7-12 years
(Age in years X 7- 5)/2


Measurement and calculation of Height

Age
Length at birth
Birth
50cm
3 months
60cm
1 year
75cm
2 years
90cm
4-5 years
100cm
5 years to 10 years
5cm/years
Adolescence
8 cm/year for girls during 12-16 years
10cm/year for boys during 14-18 years

Anthropometry formula for length, height,
Expected length gain in pediatric
Weech Formula for expected height from 2 years to 12 years
Expected height = age in years x 2 + 77 cm


Rate of gain of length/ height
Age
Gain in length/height
Up to 3 months
3.5cm/month
6-9 months
1.5cm/month
9-12 months
1.3cm/month
2-5 years
6-8cm/year
5 years to 10 years
5cm/years
Adolescence
8 cm/year for girls during 12-16 years
10cm/year for boys during 14-18 years

Head Circumference

Birth
35 cm
3 Months
40 cm
1 years
45 cm
2 years
48cm
5 years
52cm

Rate of growth of Head circumference
Up to  3 months
2 cm/month
3 months – 1 year
2cm/ 3 months
1-3 years
1cm/ 6 month
3-5 year
1cm/ year

Dines formula to estimate HC at 1 years

Normal Values of Head circumference and Chest circumference

Chest Circumference 

HC > CC @ Birth by 3cm
HC = CC @ 9-12 months
HC< CC after 1 years


Mid Arm Circumference (MUAC)

Increase in first year       11cm - 16cm
1-5 years                         16cm - 17cm 




Sources: http://www.adsa.org.za/Portals/14/Documents/Clinical20Guideline20Anthropometry.pdf
Essential pediatrics OP Ghai 
Meherban singh Clinical Methods

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